【摘要】 随着立体交通路网的发展,在机场跑道或停机坪下修建隧道的情况时有发生,这就需要研究飞机移动荷载对下穿隧道结构的影响,以确保其安全。文章依托北京市首都机场捷运工程,基于有限元法比选了节点动力荷载及面动力荷载两种简化飞机移动荷载的响应结果,结合计算结果与现场实测数据,进一步分析了飞机移动荷载对隧道结构的影响规律。结果表明:两种飞机简化荷载作用下,隧道的竖向位移变化规律相似,但节点动力荷载作用时隧道的竖向位移略大;飞机着陆点与隧道相对位置的变化对隧道结构的竖向位移变化规律影响不大;飞机位于隧道正上方三倍洞径范围内跑道时对隧道结构的动力影响是不容忽视的,不仅引起隧道结构发生明显的竖向位移,还可导致围岩压力的显著增大;而在飞机动、静荷载作用下,拱顶中心位置的围岩压力及竖向位移最大,需重点关注。更多还原

【Abstract】 With the development of the three-dimensional traffic network, there are tunnels being constructed un-derneath airport runways and aprons, and it is necessary to study the effects of the moving load of an aircraft on theunderlying tunnel structure to guarantee stability. Using the Beijing Capital Airport MRT as an example, the effectsof the aircraft’s moving load upon a tunnel structure are studied by comparing two response results of simplified air-craft moving loads(node dynamic load and surface load) by FEM. The results indicate that: 1) the variation laws oftunnel′s vertical displacement under the two simplified aircraft loads are similar, but the vertical displacement isslightly larger under the node dynamic load; 2) variation of the relative position of the aircraft′s landing and the tunnelhas little effect on the vertical displacement variation law of the tunnel structure; 3) the dynamic influence on thetunnel structure is obvious when the plane is within the scope of a runway that measures triple the tunnel diameterand is located right above the tunnel—not only does it cause apparent vertical displacement of the tunnel structure,but it also results in a significant increase of the pressure on the surrounding rock; and 4) the pressure on the sur-rounding rock and the vertical displacement at the center of the tunnel crown are the highest, and therefore requiremuch attention.更多还原